diff --git a/doc/sample.dat b/doc/sample.dat
index 4a271d6f..c810e0bd 100644
--- a/doc/sample.dat
+++ b/doc/sample.dat
@@ -1,4 +1,4 @@
-= /^Expenses:Books/
+= account =~ /^Expenses:Books/
   (Liabilities:Taxes)             -0.10
 
 ~ Monthly